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American Airlines have round trip airfares travelling from Denver (DEN) to Mexico City (MEX) for $ 249 including taxes and fees. This makes 1 stop.
Travel Availability:
Departs DEN: Sept 19-23, 25-28, 30; Oct 2-4, 14, 16-17, 21, 23-24, 30-31; Nov 3, 4, 6, 7, 10. 11
Returns: Sept 19-Oct 14, Oct 16-21, 23-28, 30; Nov 1-4, 6-11, 13-16
Use dates and book it on Orbitz [orbitz.com] or American Airlines [aa.com].
Sample attached.